This Marlin manufactured first variation feed throat with four raised circular studs (two on the left and two on the right) is for the earliest of Glenfield model 60 semi-auto rimfire rifles which use the earlier lifter spring and not the later ejector/lifter spring. This feed throat is in very good condition with light wear. (file photo)

Note: Firearms with the following years of manufacture and serial numbers have been observed with this part:

1966 or 1967: N.S.N.

1973: 27106155 & 27274660